NEM 204 - PHYSICAL METHODS:
HOT WATER & CHEMICAL DIPS
STEAM STERILIZATIONROOT PRUNING(SOIL SOLARIZATION)
125F - 10 MINUTES
125F - 20 MINUTES
HOT WATER TREATMENT:TEMPERATURE & TIME NEEDED DEPEND ON
NEMATODE SPECIESCROP VARIETY OR CULTIVAR
ACCURATE TIME AND TEMPERATURE CONTROLS ARE NEEDED
TOO HIGH OF A TEMPERATURE OR TOO LONG OF AN EXPOSURE PERIOD CAN
DAMAGE PLANT MATERIALTOO SHORT A TIME PERIOD OR TOO LOW A
TEMPERATURE MAY NOT KILL NEMATODESMAY AGGRAVATE FUNGAL PROBLEMS
qiufoliar
16141210864200
20
40
60
80
100
44.4 C46.1 C47.7 C49.4 C
Exposure period (minutes)
Mortality (%)
Aphelenchoides fragariae
qiuditylenchus
24021018015012090603000
20
40
60
80
100
42C44C46C48C
Mortality (%)
Exposure period (minutes)
Ditylenchus dipsaci
MO
RT
AL
ITY
(%
)
COMPARISON OF TIME AND TEMPERATURE
NEEDED TO KILL STEM AND BULB NEMATODE
AND FOLIAR NEMATODE
42C = 107.6F44C = 111.2F44.4C = 112F46C = 114.8F46.1C = 115F47.7C = 118F48C = 118.4F49.4C = 121F
EFFECT OF TEMPERATURE ON SURVIVAL OF PRATYLENCHUS PENETRANS AND CIRCUMFERANCE OF EASTER LILY BULBS
y = 3E+10e-0.1755x
R2 = 0.9719
y = 1E+10e-0.1619x
R2 = 0.9691
0
20
40
60
80
100
120
140
160
180
200
108 110 112 114 116 118 120 122 124 126 128 130TEMPERATURE (F)
TIME (MINUTES)
NEMATODE MORTALITY
BULB CIRCUMFERANCE
Expon. (NEMATODEMORTALITY)Expon. (BULBCIRCUMFERANCE)
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GRAPE ROOTSTOCK HOT WATER TREATMENT:
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STRAWBERRY PLANT HOT WATER TREATMENT:
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STRAWBERRY PLANT HOT WATER TREATMENT:
MONITORING HOT WATER TREATMENTS:
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STEAM STERILIZATION
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STEAM STERILIZATION
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ROOT PRUNING
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(SOIL SOLARIZATION)